Was away a few days. Thanks soybean for your interest. What I finally did is use my various cleaning utilities: Ad Aware, Spybot S&D, Win Optimizer, chkdsk, Clean up and, to my surprise, one of them must have done the trick because this early afternoon I checked my mail and it came in singly, no more duplicated. I suspect that my registry had been tampered with. I hope I can say goodbye...